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Answers for “最小-最大归一化的数学公式是什么?”

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Meet the concept

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Min-max normalization transforms a feature value XX into Xnorm=X−Xmin⁡Xmax⁡−Xmin⁡X_{\text{norm}} = \frac{X - X_{\min}}{X_{\max} - X_{\min}}, mapping the feature's observed range onto the interval [0,1][0, 1].

Conditions: Applied per numerical feature.; Requires a finite minimum Xmin⁡X_{\min} and maximum Xmax⁡X_{\max} for the feature.; Assumes Xmax⁡≠XminX_{\max} \neq X_{min} to avoid division by zero.

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Import `MinMaxScaler` from `sklearn.preprocessing`, instantiate it, and call `fit_transform` on the selected DataFrame columns. This fits the scaler to the data (learning min/max) and transforms the values to the [0, 1] range.

Conditions: Input data is numerical.; Scikit-learn library is installed.

Understand why

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Standardization centers data at the mean (μ\mu), so values below the mean become negative. Min-max normalization shifts and scales data so the minimum becomes 0 and the maximum becomes 1, keeping all values non-negative within [0, 1].

Conditions: Standardization uses z=x−μσz = \frac{x - \mu}{\sigma}.; Min-max uses Xnorm=X−Xmin⁡Xmax⁡−Xmin⁡X_{\text{norm}} = \frac{X - X_{\min}}{X_{\max} - X_{\min}}.